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Then unplug all other HD's, swap the cable for DISK0 to the Win7 HD if at all possible.

Now boot into Win7 installation media or System Repair Disk to run Startup Repair - Run 3 Separate Times until Win7 starts and System Reserved holds the System Active flag. This is the only method that will handle all aspects of moving the boot files including rewriting the Repair console to F8 boot menu.

You can then plug back in the other HD's and make sure their partitions are all still marked Inactive.

Then unplug all other HD's, swap the cable for DISK0 to the Win7 HD if at all possible.

Now boot into Win7 installation media or System Repair Disk to run Startup Repair - Run 3 Separate Times until Win7 starts and System Reserved holds the System Active flag. This is the only method that will handle all aspects of moving the boot files including rewriting the Repair console to F8 boot menu.

You can then plug back in the other HD's and make sure their partitions are all still marked Inactive.

When i boot into recovery, the actual C drive is assigned the letter D, which is the drive where the boot files were placed, but its disconnected now, while the reserved partition is assigned C. Is there a way to change this letter back to C?

The drive letters are not always the same in WinRE. Follow the steps closely in blue link tutorial to mark Inactive. If you need a picture of the drives with labels affixed use Partition Wizard

I gave you the exact steps to resolve this, which have worked tens of thousands of times here before.

Any other questions?

Dont worry, I understood the process, I had actually sorta fixed it, though your process was much more official

I was just concerned, because repair showed that the recovered OS was on the 'D' drive, while the original D drive still has the old boot files, & EasyBCD still recognises it as the boot device, however the main drive still boots fine without the original D drive attached, so i guess i can live with 2 copies of the boot manager.

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